WM8946 datasheet(2/175 Pages) WOLFSON

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WM8946

Production Data

PD, July 2012, Rev 4.3

TABLE OF CONTENTS

DESCRIPTION....................................................................................................... 1

FEATURES............................................................................................................ 1

APPLICATIONS..................................................................................................... 1

TABLE OF CONTENTS......................................................................................... 2

BLOCK DIAGRAM ................................................................................................ 5

PIN CONFIGURATION .......................................................................................... 6

ORDERING INFORMATION.................................................................................. 6

PIN DESCRIPTION................................................................................................ 7

ABSOLUTE MAXIMUM RATINGS ........................................................................ 8

RECOMMENDED OPERATING CONDITIONS..................................................... 8

THERMAL PERFORMANCE................................................................................. 9

ELECTRICAL CHARACTERISTICS ................................................................... 10

TERMINOLOGY............................................................................................................. 13

TYPICAL PERFORMANCE................................................................................. 14

POWER CONSUMPTION .............................................................................................. 15

AUDIO SIGNAL PATHS DIAGRAM .................................................................... 16

SIGNAL TIMING REQUIREMENTS .................................................................... 17

SYSTEM CLOCK TIMING.............................................................................................. 17

AUDIO INTERFACE TIMING ......................................................................................... 17

MASTER MODE ........................................................................................................................................17

SLAVE MODE ...........................................................................................................................................18

CONTROL INTERFACE TIMING ................................................................................... 19

DEVICE DESCRIPTION ...................................................................................... 22

INTRODUCTION............................................................................................................ 22

ANALOGUE INPUT SIGNAL PATH ............................................................................... 23

INPUT PGA ENABLE ................................................................................................................................24

INPUT PGA CONFIGURATION ................................................................................................................24

MICROPHONE BIAS CONTROL ..............................................................................................................25

INPUT PGA GAIN CONTROL ...................................................................................................................25

DIGITAL MICROPHONE INTERFACE .......................................................................... 28

ANALOGUE-TO-DIGITAL CONVERTER (ADC)............................................................ 29

ADC VOLUME CONTROL.........................................................................................................................30

ADC HIGH PASS FILTER .........................................................................................................................32

DSP CORE..................................................................................................................... 33

DSP CONFIGURATION MODES ..............................................................................................................33

LOW-PASS / HIGH-PASS FILTER (LPF/HPF)..........................................................................................34

3D SURROUND ........................................................................................................................................35

5-NOTCH FILTER .....................................................................................................................................35

DF1 FILTER...............................................................................................................................................37

RETUNE

TM FILTER ...................................................................................................................................37

5-BAND EQ ...............................................................................................................................................38

DYNAMIC RANGE CONTROL (DRC).......................................................................................................38

SIGNAL ENHANCEMENT REGISTER CONTROLS.................................................................................38

DYNAMIC RANGE CONTROL (DRC) ........................................................................... 40

DRC COMPRESSION / EXPANSION / LIMITING.....................................................................................40

GAIN LIMITS .............................................................................................................................................43

GAIN READBACK .....................................................................................................................................44

DYNAMIC CHARACTERISTICS ...............................................................................................................44

ANTI-CLIP CONTROL...............................................................................................................................46

QUICK-RELEASE CONTROL ...................................................................................................................46

DRC INITIAL VALUE .................................................................................................................................47

WM8946 数据表(PDF) 2 Page - Wolfson Microelectronics plc

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